Discharge in boys pants?

Hi, I'm posting this for my sister, my nephew has been getting discharge in his pants. Quite a lot and quite often, almost every day. He also can go from 7pm at night before bed until the following afternoon without having a wee. She's currently got a referral to paediatric urology for him because his testicles aren't there, but the appointment is still almost 2 months away.Should she take him back to the gp about these issues or just wait until his referral appointment? Has anyone else had this?